Muncie side cover bolts

[Tom B.]

I have aftermarket bolts on my 66 M20 side cover. What is the correct bolt head marking for this trans?

[Jimmy G.]

Re: Muncie side cover bolts

Almost anything period correct such as U, M, TR, SBC, UR, A and probably several others should be acceptable.
Should be 5/16 - 18 x 3/4 phosphate
Just my opinion and observations

[David B.]

Re: Muncie side cover bolts

Side cover bolt PN 100121 5/16 -18 x 3/4 PLAIN

[Chris T.]

Re: Muncie side cover bolts

Tom, my Nov. 65 built car has head marking "L" bolts for the trans. side cover.